<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>波纹效果</title>
<style>
  .wave-effect {
    width: 100px;
    height: 100px;
    background-color: #3399FF;
    border-radius: 50%;
    position: relative;
    animation: wave-effect 1s infinite;
  }
 
  @keyframes wave-effect {
    0% {
      transform: scale(1);
    }
    70% {
      transform: scale(1.1);
    }
    100% {
      transform: scale(1);
    }
  }
</style>
</head>
<body>
<div class="wave-effect"></div>
</body>
</html>